MOSI/MISO/SCK SPI pins are connected to the default SPI port on the QT Py
SDA/SCL I2C pins are connected to the I2C port on the QT Py headers – some boards have a separate QT Py I2C port, so keep in mind they may be separate busses.
TFT CS on TX pin – but can be re-configured/disabled by cutting a solder jumper.
TFT DC on RX pin – but can be re-configured/disabled by cutting a solder jumper.
We also have ‘sometimes used’ pins that can be re-configured/disabled by cutting a solder jumper
IRQ on A0 pin – Many of our displays don’t use the IRQ pin unless there’s a touchscreen.
Touch CS on A1 pin – Many of our displays don’t have a touchscreen.
Memory CS on A2 pin – Only our E-Ink displays have a separate memory SRAM chip, which you may be able to skip using on most QT Py’s.
SD Card CS on A3 pin – Or use for whatever you like if you aren’t using the SD Card socket on of our display breakouts.
There are also two through-hole solder pads for extra pins that are often considered optional, and we didn’t have any more IO to spare. If you aren’t using any of the 4 pins above or the I2C port, you could wire these two pins with jumper wires as you desire.
Backlight control – this is default on for most of our displays or unused on E-Ink,
Display reset – this is default on for most of our displays. Sometimes it’s used for low-power on E-Ink.
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